How to save ajax calling values into a variable - php

Question

Hope you are all good. I have a problem that is I use an extension i.e. select2 which shows all Products' name in the dropdown list and it works fine to me. In my database, every product has individual price. So, I want to show the sum of all selected products' price in the next of dropdown. So, I used ajax to send the product id to the controller to find the product price. Unfortunately, I can't sum all of product price because when I add new product then previous Id of product gets change then price also gets change. But I want to hold the price of products in a variable when product is selected.
the form code:
<div class="row">
<?php echo $form->labelEx($model,'item_list'); ?>
<?php
$data = CHtml::listData(Products::model()->findAll(),'id', 'name');
echo Select2::activeMultiSelect(
$model, 'item_list', $data, array(
'required' => 'required',
'style' => 'width: 270px;',
'placeholder' => 'Add Product',
'select2Options' => array(),
'ajax' => array('type'=>'POST',
'url'=>$this->createUrl('totalOrderPrice'), //url to call.
'update'=>'#price', //selector to update
'data'=>array('item_list'=>'js:this.value'),
),
)
);
?>
<?php echo $form->error($model,'item_list'); ?>
</div>
the controller code:
...
...
public $prices;
...
...
public function actionTotalOrderPrice(){
$data = Products::model()->findByPk(array('id'=>$_POST['item_list']));
$this->prices += $data->prices;
echo CHtml::tag('input', array( 'type'=>'text' , 'name'=>'Order[price]' , 'value' => $this->prices));
}
I spent a lot of time to solve this problem but anyhow couldn't. Please help someone.
Thanks in advance,
Shimul

Answer 1

Since I don't have products schema , I have used another model i.e User to give you can example of how it could be done.
<div class="row">
<?php
$model=User::model();
$attribute='products';
$data = CHtml::listData(Yii::app()->db->createCommand("select id, concat(RAND()*1000,':',username) as name FROM `User` ")->queryAll(),'id','name');
echo Select2::activeMultiSelect($model,$attribute, $data,
array(
'required' => 'required',
'style' => 'min-width:200px',
'placeholder' => 'Choose User',
'select2Options'=>array(
'formatResult'=>'js:format',
'formatSelection'=>'js:format',
),
'onChange'=>'js:{
var total=0;
$($(this).select2("data")).each(function(){
total+=this.text.split(":")[0]*1;
});
$("#total > label").text(total);
}',
)
);
$js_format_fun = <<<JS
function format(opt){
var price_lbl=opt.text.split(':');
return price_lbl[1];
}
JS;
Yii::app()->clientScript->registerScript('select2_format_option', $js_format_fun, CClientScript::POS_READY);
?>
</div>
<br/>
<div id="total"><strong>Total Price: </strong><label></label></div>
You will see sth like this:
The idea is to avoid ajax and add prices to names e.g product name will be of format: price:name. You split the price ,name and calculate the total as I give above.

Answer 2

Maybe you have to look outside YII, you can use javascript for this, out there, you can find JS libraries and frameworks who can help you to save variables and calculate the sum, for example CanJS has can.compute which has an observable nature so it fires events everytime the sum changes and you can implement function who does the calculation or KnockoutJS too has computed values this two libs are my favorite (I use canjs) they are lightweight and effecient and you can use them just where you need, hope this can help you

Answer 3

Store it in user session
Yii::app()->session['products_prices'] += $data->prices
But you will face a problem when you remove items from your list
I don't know this widget but there is certainly a .seralize() function witch will serialize all selected items id into a json string array.
You then can then use this array in a "in" Condition to sum your total.